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From: Jane Galt on 6 May 2010 23:39
"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote :

>
> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message
> news:Xns9D6FE9154DD23JaneGgulchxyz(a)216.196.97.142...
>> Do they make LED replacements for the instrument bulbs? I'm wondering
>> if that
>> would be a good or bad thing?
>>
>
> No, they do not. This is at least in part due to the fact that the bulbs
> can be dimmed, whereas LEDs are either on or off.

Huh?

I built things with LED for 27 years and know that aint true.



--
- Jane Galt
From: Hachiroku ハチロク on 7 May 2010 10:00
On Thu, 06 May 2010 22:39:53 -0500, Jane Galt wrote:

> "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote :
>
>
>> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message
>> news:Xns9D6FE9154DD23JaneGgulchxyz(a)216.196.97.142...
>>> Do they make LED replacements for the instrument bulbs? I'm wondering
>>> if that
>>> would be a good or bad thing?
>>>
>>>
>> No, they do not. This is at least in part due to the fact that the bulbs
>> can be dimmed, whereas LEDs are either on or off.
>
> Huh?
>
> I built things with LED for 27 years and know that aint true.

Wow! Here's a thought. Get some of those LEDs that change color at
different voltages. Then you couls switch between red, green and yellow
dash depending in where the voltage is!


From: SMS on 7 May 2010 16:33
Jeff Strickland wrote:
> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message
> news:Xns9D6FE9154DD23JaneGgulchxyz(a)216.196.97.142...
>> Do they make LED replacements for the instrument bulbs? I'm wondering if
>> that
>> would be a good or bad thing?
>>
>
> No, they do not. This is at least in part due to the fact that the bulbs can
> be dimmed, whereas LEDs are either on or off.

Not true. You dim an LED by reducing the current, while an incandescent
bulb is dimmed by reducing the voltage. It would be possible to build an
LED replacement for an incandescent bulb that is dimmable.
From: Jeff Strickland on 7 May 2010 20:47

"SMS" <scharf.steven(a)geemail.com> wrote in message
news:4be4792c$0$1661$742ec2ed(a)news.sonic.net...
> Jeff Strickland wrote:
>> "Jane Galt" <Jane_G(a)gulch.xyz> wrote in message
>> news:Xns9D6FE9154DD23JaneGgulchxyz(a)216.196.97.142...
>>> Do they make LED replacements for the instrument bulbs? I'm wondering if
>>> that
>>> would be a good or bad thing?
>>>
>>
>> No, they do not. This is at least in part due to the fact that the bulbs
>> can be dimmed, whereas LEDs are either on or off.
>
> Not true. You dim an LED by reducing the current, while an incandescent
> bulb is dimmed by reducing the voltage. It would be possible to build an
> LED replacement for an incandescent bulb that is dimmable.


I did not know that. I thought an LED had two speeds, on and off.







From: Daniel who wants to know on 7 May 2010 23:11
"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message
news:hs2cc7$sne$1(a)news.eternal-september.org...
>>
>> Not true. You dim an LED by reducing the current, while an incandescent
>> bulb is dimmed by reducing the voltage. It would be possible to build an
>> LED replacement for an incandescent bulb that is dimmable.
>
>
> I did not know that. I thought an LED had two speeds, on and off.
>
>
>
>
>
>
>

Incandescent and LED can both also be dimmed via PWM.

The problem with LEDs is that the lumens/watt is similar to a CFL so they
don't draw enough current some times. Some cars have a simple wire wound
power rheostat for the dash light dimmer while some newer ones are PWM. If
your car is the latter LEDs should be fine, if it is the former they
probably wouldn't dim much at all because the current draw is too little. In
this image of a pull knob headlight switch the rheostat is the white ceramic
doughnut in the middle around the shaft.
http://www.the-jeep-guy.com/ELECTRICAL%20ACCESSORIES%20HEADLIGHT%20SWITCH%205451098%20and%205450558.jpg

The current draw problem also comes up when trying to replace exterior
lights with LEDs on cars with bulb-out sensors. A classic example of this
is rapidly blinking turn signals.


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